1. Fix action button selectors being cut off on the bottom, see #1759.
2. Re-applied smaller dialog max width values to match the Material spec.
3. Fix vertical spacing on datetime dialogs when there is no dialog title, see #1757.
4. Fixed neutral button positioning, although you still should prefer to not use it.
5. Use semi-transparent primary theme color for the ripple of action buttons on API 21+.